<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Hello World</title>
    <script src="vue.js"></script>
</head>
<body>
<div id="app">{{content}}</div>

<script>
    var app = new Vue({
        el: '#app',
        data: {
            content: 'Hello World'
        }
    })

    setTimeout(function () {
        app.$data.content = 'bye world'
    }, 2000)
</script>
</body>
</html>